You can disconnect your battery for a short period of time, 5-10 minutes should do it. There is no guarantee that the check engine light will not come back on in time, but it will make it go away at least temporarily.If you go to Autozone, 99% of the time they will hook up a code reader and diagnose your problem. It may be a minor and/or inexpensive fix. Please vote appropriately and leave feedback. I hope this helps and good luck.

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Sometimes it will be written in ownership books in your glove compartment, if not any lexus dealership should be able to give it to you, some dealerships may want you to come in a prove you own the car.